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Analog Devices Inc./Maxim Integrated MAX4685ETB+T
- Part No.:
- MAX4685ETB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX4685ETB+T.pdf
- Description:
- IC SWITCH SPDTX2 800MOHM 10TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,866
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Product details
Overview
MAX4685ETB+T from Maxim Integrated is a dual SPDT analog switch IC designed for low-voltage signal routing in portable and battery-powered systems. It features 0.8Ω max on-resistance (NO/NC) at +2.7V, 50ns turn-on time, 40ns turn-off time, and operates from +1.8V to +5.5V single supply. Used in audio path switching for cellular phones and MP3 players where rail-to-rail signal handling and low THD (0.03%) are critical.
For engineers reviewing the MAX4685ETB+T datasheet, MAX4685ETB+T pinout, MAX4685ETB+T application, or MAX4685ETB+T equivalent, key selection criteria include verified 12-bump UCSP package compatibility, break-before-make timing (2ns), RON matching (0.06Ω max), and 1.8V logic-level input support with no level-shifter required.
Technical Context
The MAX4685ETB+T implements two independent SPDT analog switches using BiCMOS process technology, each with matched NO and NC paths. Its break-before-make architecture prevents signal shorting during state transitions, with tBBM = 2ns min and 15ns max at +2.7V.
It supports bidirectional analog signal routing across full V+ to GND range, with rail-to-rail capability and low charge injection (200pC typical). Digital control inputs tolerate up to +5.5V regardless of V+, enabling direct interfacing with higher-voltage logic without external buffers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-Resistance (NO/NC) | 0.8Ω max at +2.7V - ensures minimal signal attenuation and voltage drop in audio and power-routing paths |
| On-Resistance Match | 0.06Ω max between channels - enables precise differential signal routing and balanced channel switching |
| Turn-On / Turn-Off Time | 50ns / 40ns max at +3V - supports fast multiplexing in real-time audio and communications circuits |
| Supply Voltage Range | +1.8V to +5.5V - allows operation directly from Li-ion, coin-cell, or regulated 3.3V/5V rails without external regulators |
| Logic Input Compatibility | 1.8V logic threshold (VIH = 1.4V, VIL = 0.5V) - interfaces natively with modern low-voltage microcontrollers and baseband processors |
| THD + Noise | 0.03% at 20Hz–20kHz - preserves audio fidelity in headset and speaker switching applications |
| Off-Isolation | −64dB at 100kHz - suppresses crosstalk between active and inactive signal paths in multi-channel routing |
Pinout & Package
MAX4685ETB+T is housed in a 12-bump, 0.5mm-pitch wafer-level chip-scale package (UCSP), occupying only 2.0mm × 1.50mm PCB area. The package has no leads and requires controlled reflow per JEDEC J-STD-020A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NC1, NC2 | Normally Closed analog terminal (Channel 1 & 2) | Provides low-RON path when IN_ = LOW; used for default signal path in headset detection or power failover |
| NO1, NO2 | Normally Open analog terminal (Channel 1 & 2) | Activates low-RON path when IN_ = HIGH; routes alternate signals such as microphone or auxiliary audio |
| COM1, COM2 | Common analog terminal (Channel 1 & 2) | Bidirectional I/O node - connects to source (e.g., codec output) or load (e.g., speaker) depending on system topology |
| IN1, IN2 | Digital control input (active-high, noninverting) | Directly accepts 1.8V logic; no pull-up required; compatible with GPIOs of ARM Cortex-M and application processors |
| V+ | Positive supply input | Single power rail for analog and digital sections; must be applied before analog signals to prevent latch-up |
| GND | Ground reference | Common return for analog signal paths and digital logic; must be low-impedance and decoupled near V+ pin |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail analog signal handling | Supports full V+ to GND swing without clipping - essential for unbuffered audio and sensor signal routing |
| Break-before-make switching | Guaranteed 2ns minimum dead time prevents momentary short-circuit between NO and NC paths during transition |
| Low leakage current | 1nA max at +25°C - minimizes DC error in precision sensor or battery-monitoring signal chains |
| Low crosstalk | −68dB at 100kHz - isolates adjacent audio channels or RF/data lines sharing same PCB layer |
| Small UCSP footprint | 2.0mm × 1.50mm area - reduces board space by >70% vs. µMAX or TDFN alternatives, critical for ultra-thin mobile designs |
Applications
| Speaker Headset Switching | MP3 Player Audio Routing |
|---|---|
Use Scenario: Automatic detection and routing between built-in speaker and 3.5mm headset jack in smartphones. IC Role / Device Role / Timing Role: Dual SPDT switch toggles audio output path based on mechanical jack insertion detection signal. Use Value: Enables seamless audio path reconfiguration with <0.8Ω RON to preserve loudness and <0.03% THD to maintain fidelity. |
Use Scenario: Selecting between left/right stereo outputs and mono speaker in portable media players. IC Role / Device Role / Timing Role: Bidirectional analog switch routes DAC outputs to either headphone amplifier or internal speaker driver. Use Value: Low 50ns switching time avoids audible click/pop; rail-to-rail operation handles full DAC swing without distortion. |
| Power Routing in Wearables | Relay Replacement in IoT Sensors |
Use Scenario: Dynamically connecting/disconnecting charging circuitry or sensor bias rails in compact wearables. IC Role / Device Role / Timing Role: Low-RON SPDT path controls power delivery to subsystems under MCU GPIO command. Use Value: 0.8Ω RON limits voltage drop to <80mV at 100mA - maintains stable bias for MEMS sensors and BLE radios. |
Use Scenario: Replacing electromechanical relays in battery-powered environmental sensor nodes. IC Role / Device Role / Timing Role: Solid-state switch isolates measurement circuits during standby to reduce quiescent current. Use Value: 1nA max off-leakage extends battery life beyond 10 years in low-duty-cycle monitoring applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual SPDT analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4684ETB+T | Asymmetric RON: 0.5Ω (NC) / 0.8Ω (NO) at +2.7V - optimized for headset detection where NC path carries primary audio | Preferred for jack-insertion sensing with separate mic/speaker paths requiring different RON tolerance | Select MAX4684ETB+T when NC path demands lower on-resistance than NO path; not pin-compatible due to differing internal routing |
| TMUX1574RTER | Higher RON (1.3Ω typ), wider supply (1.08V–5.5V), smaller 10-pin WQFN (1.6mm × 1.6mm) | Better suited for ultra-low-voltage IoT sensors (<1.2V operation); lacks UCSP's 2.0mm × 1.5mm footprint advantage | Choose TMUX1574RTER only if sub-1.2V operation is mandatory; otherwise MAX4685ETB+T offers superior RON, THD, and size |
Compared with MAX4684ETB+T and TMUX1574RTER, MAX4685ETB+T delivers symmetrical 0.8Ω RON, best-in-class 0.03% THD, and smallest PCB footprint - making it optimal for space-constrained, high-fidelity audio routing where matched channel performance is required.
Availability
MAX4685ETB+T is available at Aetrix Electronics and suitable for cellular phone design, portable audio equipment, and battery-operated medical monitors requiring stable component supply and long-term lifecycle assurance.
Supply support for MAX4685ETB+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX4684/MAX4685 product line was engineered for ultra-low-voltage, space-constrained portable electronics - delivering high-speed, low-distortion analog switching in wafer-level chip-scale packaging.
FAQ
What is the maximum supply voltage rating for MAX4685ETB+T?
The absolute maximum supply voltage (V+) for MAX4685ETB+T is +6V. However, the device is fully specified for operation from +1.8V to +5.5V. Exceeding +6V may cause permanent damage. For reliable long-term use, keep V+ within the recommended operating range and ensure proper power sequencing - apply V+ before analog signals to avoid latch-up.
Does MAX4685ETB+T support bidirectional analog signal routing?
Yes, MAX4685ETB+T supports fully bidirectional analog signal routing on all COM, NO, and NC terminals. Signals can flow from COM to NO/NC or vice versa without performance degradation. This enables flexible topologies such as shared audio buses or reconfigurable sensor interfaces - a key advantage over unidirectional switches in compact portable designs.
Can MAX4685ETB+T be used with a 1.8V logic supply while powered from 3.3V?
Yes. MAX4685ETB+T accepts 1.8V logic levels (VIH = 1.4V, VIL = 0.5V) regardless of V+ supply voltage. When V+ = 3.3V, the digital inputs remain compatible with 1.8V GPIOs without level shifters. This simplifies interface design in mixed-voltage systems like smartphone baseband processors driving analog switches powered from PMIC rails.
What is the thermal limit for soldering MAX4685ETB+T's UCSP package?
MAX4685ETB+T's 12-bump UCSP requires strict adherence to JEDEC J-STD-020A reflow profile. Peak bump temperature is limited to +220°C (infrared, 15s) or +215°C (vapor phase, 60s). Hand soldering and wave soldering are prohibited. Preheating is mandatory, and board layout must follow Maxim's UCSP land pattern guidelines to ensure solder joint integrity and long-term reliability.
How does MAX4685ETB+T achieve low THD in audio applications?
MAX4685ETB+T achieves 0.03% THD through low on-resistance flatness (0.35Ω max), symmetrical channel matching (0.06Ω RON delta), and minimized charge injection (200pC typical). These parameters reduce harmonic generation during signal passage - especially critical for full-scale audio signals crossing the switch near rail voltages. Verified performance is documented at 20Hz–20kHz into 600Ω loads.
MAX4685ETB+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Switch Circuit:
- SPDT
- Multiplexer/Demultiplexer Circuit:
- 2:1
- Number of Circuits:
- 2
- On-State Resistance (Max):
- 800mOhm
- Channel-to-Channel Matching (ΔRon):
- 60mOhm (Typ)
- Voltage - Supply, Single (V+):
- 1.8V ~ 5.5V
- Voltage - Supply, Dual (V±):
- -
- Switch Time (Ton, Toff) (Max):
- 50ns, 30ns
- -3db Bandwidth:
- -
- Charge Injection:
- 200pC
- Channel Capacitance (CS(off), CD(off)):
- 84pF, 37pF
- Current - Leakage (IS(off)) (Max):
- 1nA
- Crosstalk:
- -68dB @ 100kHz
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TDFN (3x4)
MAX4685ETB+T FAQ
1.How can I place an order for MAX4685ETB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4685ETB+T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX4685ETB+T reliable?
The price and inventory of MAX4685ETB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4685ETB+T is usually 5 days.
3.What payment methods are accepted for MAX4685ETB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4685ETB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4685ETB+T?
MAX4685ETB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4685ETB+T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX4685ETB+T?
For technical support, including MAX4685ETB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4685ETB+T requirements.
6.How does Aetrix verify that MAX4685ETB+T is sourced from the original manufacturer or authorized distributors?
All MAX4685ETB+T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX4685ETB+T meets industry standards.
7.What is the process for return or replacement of MAX4685ETB+T?
All MAX4685ETB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4685ETB+T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX4685ETB+T part is unused and in its original packaging.
Return procedure for MAX4685ETB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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